Simple question does the 1gb file size without contacting support apply to the dropbox option or if its dropbox then its whatever you have on your box?
I've never used it, but my understanding is that the "Choose from Dropbox" option uploads the files from Dropbox to Itch.io, so the same limit would still apply. Dropbox isn't really designed for web hosting so I don't think there's any way to embed the game straight from Dropbox. That said, if you email support@itch.io and ask them to raise your limit they'd probably do it.